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In communication systems, what is the function of a duplexer device in relation to transmitters, receivers, and a common antenna?

Difficulty: Easy

Correct Answer: Connect a receiver and a transmitter to the same antenna

Explanation:


Introduction / Context:
A duplexer is an important device in modern communication systems, particularly in radar and radio transceivers, where both transmission and reception must occur using a single antenna. This avoids the need for separate antennas and simplifies system design while ensuring isolation between transmit and receive paths.


Given Data / Assumptions:

  • One antenna is shared by transmitter and receiver.
  • Transmitter produces high power RF signals.
  • Receiver requires protection from transmitter output while remaining sensitive to weak incoming signals.


Concept / Approach:
The duplexer is a switching or filtering device that alternately connects the antenna to the transmitter during transmission and to the receiver during reception. In radar, fast switches like TR (transmit–receive) cells or circulators are used to achieve this.


Step-by-Step Solution:

Requirement: single antenna for both Tx and Rx.Duplexer ensures isolation of receiver when transmitter is active.During reception, it connects antenna to sensitive receiver while isolating transmitter.


Verification / Alternative check:

Radar block diagrams confirm that duplexers sit between antenna, transmitter, and receiver.


Why Other Options Are Wrong:

Feeding multiple receivers: that is done by a power divider, not a duplexer.Connecting two transmitters: requires a combiner, not a duplexer.Multiple antennas: unrelated to duplexing function.


Common Pitfalls:

Confusing duplexer with diplexer (frequency multiplexer).Assuming duplexer amplifies or processes signals—it only switches/isolates.


Final Answer:

Connect a receiver and a transmitter to the same antenna
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